Windows XP Service Pack 3 (SP3) is currently in development. As of November 2007, Microsoft's web site indicates a "preliminary" release date to be in the first half of 2008.[26] A feature set overview has been posted by Microsoft [27] and details new features available separately as standalone updates to Windows XP, as well as features backported from Windows Vista (e.g. black hole router detection, Network Access Protection).
Microsoft has begun a beta test of Service Pack 3.[28] According to a file released with the official beta, and relayed onto the internet, there are a total of 1073 fixes in SP3.[29]
This update to Windows allows it to be installed without a product key, and be run until the end of the mandatory 30-day activation period without one. The latest testing build of Service Pack 3 is the Release Candidate build, 3264.
On December 4, 2007, Microsoft released the RC version of Service Pack 3 to both TechNet and MSDN Subscribers. On December 18, 2007, this version is made publicly available via Microsoft Download Center.